SCRAPING AND BANDING FOR CODLING MOTH CONTROL H 



STICKY BANDS AS COMPARED WITH BETA-NAPHTHOL 



BANDS 



Two proprietary sticky-banding or barrier materials are used in 

 the Yakima and Wenatchee districts, primarily as barriers for mites 

 and climbing cutworms but also from time to time for capturing 

 codling moth larvae. In orchard tests to compare the efficiency of 

 the two types of bands, the beta-naphthol bands caught 13 times as 

 many worms per inch of band as did the sticky bands. The latter 

 cannot be depended on as an effective barrier or trap for the codling 

 moth larvae. 



LARGE-SCALE ORCHARD TESTS OF SCRAPING AND 



BANDING 



A large-scale experiment was begun at Yakima in July 1935 to 

 determine what control could be obtained from scraping and band- 

 ing blocks of several acres of apple trees as a supplement to the spray- 

 ing program. This experiment was continued and enlarged upon for 

 8 years, during which time tests were made in six orchards, on five 

 common commercial varieties of apples grown in the Pacific North- 

 west — Jonathan, Winesap, Rome Beauty, and a few Delicious and 

 Arkansas Black. 



Experimental Methods 



The tests were set up with plots of several acres of scraped and 

 banded trees, with adjoining plots of the same varieties that were not 

 scraped and banded. All the plots received the same spray treat- 

 ments. On the banded trees the rough bark was scraped from the 

 branches, scaffold limbs, and trunks, including 2 to 3 inches below 

 the ground line. Scrapings were caught on a tarpaulin spread under 

 the tree and were burned. Except as otherwise noted, the scraping 

 was done in the spring before moth emergence began. Only proprie- 

 tary bands were used in these tests. The bands contained approxi- 

 mately 2 pounds of beta-naphthol to each 100 linear feet of 2-inch 

 band, in the proportion of 1 pound of beta-naphthol to iy 2 pints of 

 heavy oil. They were applied about the middle of June, in time to 

 capture the first larvae to leave the fruit. 



The bands were removed either in November after fruit harvest 

 or the following spring. The number of larvae captured in the bands 

 was recorded for each tree. The control value of scraping and band- 

 ing was determined by examining representative samples of harvested 

 and dropped fruit from the treated and the check plots. 



Samples of 250 apples per count tree were taken at random, an 

 equal number from each box of picked and dropped fruit, as discussed 

 by Newcomer, Dean, and Cassil, (9) . Samples were taken from each 

 variety that was sufficiently represented in both treated and check 

 plots. Kecords were made of the number of apples that were clean, 

 wormy, and stung, and of the number of worms and stings per 

 injured apple. 



Description of Plots 



The first tests were made in the Gilbert orchard in July 1935. Large 

 bearing trees on approximately 10 acres were scraped and banded. 



